Range hood, air inlet adjusting structure, fan and control method of fan

Abstract

The application provides a range hood, an air inlet adjusting structure, a fan and a control method of the fan, and relates to the technical field of range hoods. The air inlet adjusting structure mainly comprises a guide vane support, a plurality of guide vanes, a transmission member and a driving motor. The plurality of guide vanes are movably connected with the guide vane support and can be deflected relative to the guide vane support; the transmission member is in transmission connection with all the guide vanes; and the driving motor is in driving connection with any guide vane and is used for driving one guide vane to deflect so as to drive the remaining guide vanes to deflect. According to the embodiments provided in the application, the plurality of guide vanes are linked through the transmission member, the driving motor drives one guide vane to deflect, one deflected guide vane drives the remaining guide vanes to deflect synchronously, the installation angles of all the guide vanes are adjusted, and the adjustment of the air inlet angle is realized.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a range hood, an air intake adjustment structure, a fan, and a fan control method. Background Technology

[0002] When a range hood is running, a negative pressure is created at the inlet of the centrifugal fan's air intake ring, causing airflow to enter the ring. Due to the unique design of the volute, the circumferential negative pressure distribution within the air intake ring is uneven, resulting in uneven airflow velocity and affecting fan performance to some extent. To address this issue, resistance components or pre-rotating guide vanes are typically added to the air intake ring, such as annular iron mesh, honeycomb iron mesh, or pre-rotating guide vanes. The purpose is to make the airflow pressure within the air intake ring more uniform or to improve the airflow direction, aligning the airflow direction with the impeller's rotation direction, thereby reducing aerodynamic noise.

[0003] However, the fixed-angle pre-rotating guide vane air intake grille can only achieve performance improvement within a certain back pressure range, making it difficult to adapt to all operating conditions. Summary of the Invention

[0004] This application addresses the shortcomings of existing methods by providing a range hood, an air intake adjustment structure, a fan, and a fan control method to solve the technical problem that existing technologies with fixed-angle pre-rotating guide vane air intake grilles can only achieve performance improvement within a certain back pressure range and are difficult to adapt to all operating conditions.

[0005] In a first aspect, embodiments of this application provide an air intake adjustment structure applied to a range hood. The air intake adjustment structure includes a guide vane support, multiple guide vanes, a transmission component, and a drive motor. The multiple guide vanes are movably connected to the guide vane support and can deflect relative to the guide vane support; the transmission component is drively connected to all the guide vanes; the drive motor is drively connected to any one of the guide vanes, and the drive motor is used to drive one guide vane to deflect, thereby causing the remaining guide vanes to deflect.

[0006] As an optional implementation, the multiple guide vanes are elongated, all of which are distributed along the outer periphery of the guide vane support. The first end of each guide vane is movably connected to the guide vane support, and the second end is away from the guide vane support. The transmission member is annular and surrounds the outside of the guide vane support, and the transmission member passes through all of the guide vanes.

[0007] As an optional implementation, the transmission component includes two rings arranged concentrically and spaced apart along the axial direction.

[0008] As an optional implementation, the air intake adjustment structure further includes an air intake ring surrounding the outside of the guide vane support; the second end of all the guide vanes is movably connected to the air intake ring.

[0009] As an optional implementation, the guide vane support is annular, and the plurality of guide vanes are evenly distributed circumferentially along the guide vane support and all extend radially along the guide vane support.

[0010] As an optional implementation, the first ends of the plurality of guide vanes pass through the guide vane bracket; the drive motor is fixed to the inner side of the guide vane bracket and is drivenly connected to the first end of any of the guide vanes.

[0011] Secondly, embodiments of this application provide a fan, which includes a volute, an air inlet adjustment structure as described in any of the preceding embodiments, and a sound pressure detection device; the air inlet adjustment structure is assembled to the air inlet of the volute; the sound pressure detection device is assembled to the volute and close to the air inlet of the volute.

[0012] Thirdly, this application provides a range hood, which mainly includes the air intake adjustment structure described in any of the foregoing embodiments.

[0013] Fourthly, this application provides a control method for the fan described in the foregoing embodiments, which mainly includes: after power failure and startup, acquiring first sound pressure data multiple times at preset time intervals; controlling all guide vanes to deflect from a preset position to a first direction by a first angle; if any two adjacent acquisitions of first sound pressure data conform to a preset coarse adjustment rule, then controlling all guide vanes to continue deflecting to the first direction by a first angle; if any two adjacent acquisitions of first sound pressure data conform to a preset reverse adjustment rule, then controlling all guide vanes to deflect to a second direction by a second angle; the first direction and the second direction are opposite; the second angle is smaller than the first angle; if the acquired first sound pressure data conforms to a preset first air inlet angle determination rule, then using the angle after the last guide vane deflection as the appropriate air inlet angle.

[0014] As an optional implementation, the coarse adjustment rule includes: the difference between the first sound pressure data obtained in the previous acquisition and the first sound pressure data obtained in the subsequent acquisition is greater than or equal to a preset first sound pressure difference.

[0015] As an optional implementation, the reverse adjustment rule includes: the difference between the first sound pressure data acquired in the later acquisition and the first sound pressure data acquired in the previous acquisition is less than a preset first sound pressure difference.

[0016] As an optional implementation, the first air inlet angle determination rule includes: meeting the reverse adjustment rule twice consecutively.

[0017] As an optional implementation, the control method of the fan further includes: after power is cut off and the fan is turned on, acquiring second sound pressure data multiple times at preset time intervals; if the acquired second sound pressure data conforms to a preset first pressure increase rule, controlling all guide vanes to deflect to a second angle in a second direction; if the newly acquired second sound pressure data conforms to a preset first fine-tuning rule, controlling all guide vanes to deflect to a second angle in a second direction; if the newly acquired second sound pressure data conforms to a preset second air inlet angle determination rule, using the angle after the last guide vane deflection as the new suitable air inlet angle.

[0018] As an optional implementation, the fan control method further includes: if the newly acquired second sound pressure data conforms to a preset second pressure increase rule, then control all guide vanes to deflect to a first angle in a first direction; the first angle is twice the second angle; if the second sound pressure data is acquired again conforms to a preset second fine-tuning rule, then control all guide vanes to deflect to a second angle in the first direction; if the second sound pressure data is acquired again conforms to a preset third air inlet angle determination rule, then use the angle after the last guide vane deflection as the new suitable air inlet angle.

[0019] This application provides a range hood, an air intake adjustment structure, a fan, and a fan control method. The technical solution provided by the embodiments of this application brings at least the following beneficial effects:

[0020] Multiple guide vanes are linked together through a transmission component. The drive motor drives one guide vane to deflect, and the deflected guide vane drives the remaining guide vanes to deflect synchronously, so as to adjust the installation angle of all guide vanes and thus achieve the adjustment of the air inlet angle.

[0021] Based on the acquired sound pressure data, the guide vanes are continuously deflected to an installation angle that is suitable for the current operating conditions, thereby improving aerodynamic noise and meeting all operating conditions.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of a range hood provided in an embodiment of this application;

[0025] Figure 2 A schematic diagram illustrating the positional relationship between the guide vane and the transmission component in a range hood, where the angle of tangency is 90 degrees, is provided for an embodiment of this application.

[0026] Figure 3 for Figure 2A schematic diagram of the cross-section;

[0027] Figure 4 A schematic diagram illustrating the positional relationship between the guide vane and the transmission component in a range hood, where the angle of tangency is 80 degrees, is provided for an embodiment of this application.

[0028] Figure 5 for Figure 4 A schematic diagram of the cross-section;

[0029] Figure 6 A schematic diagram illustrating the positional relationship between the guide vane and the transmission component in a range hood, with a tangent angle of 20 degrees, provided for an embodiment of this application;

[0030] Figure 7 for Figure 6 A schematic diagram of the cross-section;

[0031] Figure 8 A flowchart illustrating steps S101-S105 of a fan control method provided in an embodiment of this application;

[0032] Figure 9 A flowchart illustrating steps S201-S204 of a fan control method provided in an embodiment of this application;

[0033] Figure 10 This is a flowchart illustrating steps S205-S207 of a fan control method provided in an embodiment of this application.

[0034] Figure labels and corresponding explanations:

[0035] 1: Guide vane support;

[0036] 2: Guide vane;

[0037] 3: Transmission components;

[0038] 4: Drive motor;

[0039] 5: Air intake ring;

[0040] 6: Snail shell;

[0041] 7: Sound pressure detection device. Detailed Implementation

[0042] This application is described in detail below. Examples of embodiments of this application are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. Furthermore, detailed descriptions of known technologies that are unnecessary for the features of this application are omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0043] like Figure 1-7 As shown in the figure, this application provides an air intake adjustment structure for use in a range hood. The air intake adjustment structure mainly includes a guide vane support 1, multiple guide vanes 2, a transmission component 3, and a drive motor 4. The multiple guide vanes 2 are movably connected to the guide vane support 1, and the multiple guide vanes 2 can deflect relative to the guide vane support 1; the transmission component 3 is drively connected to all guide vanes 2; the drive motor 4 is drively connected to any one of the guide vanes 2, and the drive motor 4 is used to drive one guide vane 2 to deflect, thereby causing the remaining guide vanes 2 to deflect.

[0044] The air intake adjustment structure provided in this application embodiment has multiple guide vanes 2 linked together by a transmission component 3. A drive motor 4 drives one guide vane 2 to deflect, and the deflected guide vane 2 drives the remaining guide vanes 2 to deflect synchronously, so as to adjust the installation angle of all guide vanes 2 and thus realize the adjustment of the air intake angle.

[0045] As an optional implementation, the multiple guide vanes 2 are elongated and distributed along the outer periphery of the guide vane support 1. The first end of each guide vane 2 is movably connected to the guide vane support 1, and the second end is away from the guide vane support 1. The transmission member 3 is annular and surrounds the outside of the guide vane support 1, and the transmission member 3 passes through all the guide vanes 2.

[0046] Based on the aforementioned embodiments, in this embodiment, the guide vane 2 has a long, strip-shaped sheet structure. The guide vane support 1 is centrally located, and all guide vanes 2 are distributed around the guide vane support 1, providing sufficient support for the guide vanes 2. The transmission component 3 is annular and surrounds the outside of the guide vane support 1, passing through all guide vanes 2 to form a stable transmission relationship. The guide vane 2 rotates around its own axis, and the airflow flows along the surface of the guide vane 2. The air inlet angle can be adjusted by the installation angle after the guide vane 2 deflects.

[0047] As an alternative implementation, the transmission component 3 includes two rings that are spaced apart and concentrically arranged along the axial direction.

[0048] Based on the aforementioned embodiments, in this embodiment, the transmission component 3 includes two circular ring structures, which are concentrically arranged. Sufficient friction exists between the transmission component 3 and all the guide vanes 2. The deflected guide vanes 2 apply force to the transmission component 3. Because the two circular ring structures are arranged side-by-side and concentrically, they smoothly transmit the force to the remaining guide vanes 2, thereby achieving deflection of all guide vanes 2 in the same direction and angle.

[0049] As an optional implementation, the air intake adjustment structure also includes an air intake ring 5, which surrounds the outside of the guide vane support 1; the second end of all guide vanes 2 is movably connected to the air intake ring 5.

[0050] Based on the aforementioned embodiments, in this embodiment, the air inlet ring 5 is part of the volute 6, that is, the portion surrounding the outside of the air inlet of the volute 6; optionally, the air inlet ring 5 is integrally formed with the side plate of the volute 6. The guide vane support 1 and the guide vane 2 are both located inside the air inlet ring 5. The guide vane 2 is disposed between the guide vane support 1 and the air inlet ring 5, and both the air inlet ring 5 and the guide vane support 1 provide sufficient support for the deflection of the guide vane 2.

[0051] As an optional implementation, the guide vane support 1 is annular, and multiple guide vanes 2 are evenly distributed around the guide vane support 1 and extend radially along the guide vane support 1.

[0052] Using the above scheme, the transmission component 3 is set between the guide vane support 1 and the air inlet ring 5, and the transmission component 3 passes through all the guide vanes 2 in the circumferential direction to form a grid structure.

[0053] As an optional implementation, the first ends of multiple guide vanes 2 are inserted through the guide vane bracket 1; the drive motor 4 is fixed inside the guide vane bracket 1 and is drivenly connected to the first end of any guide vane 2.

[0054] Based on the aforementioned embodiments, in this embodiment, the first end of all guide vanes 2 has a structure that is thinner in the middle and thicker on both sides. The thinner segment of the first end of all guide vanes 2 passes through the guide vane bracket 1, and the thicker structure on both sides is clamped in the guide vane bracket 1, so as to fix the first end of the guide vane 2 to the guide vane bracket 1. The drive motor 4 is fixed inside the guide vane bracket 1 to make effective use of space and make the structure more compact.

[0055] Based on the same inventive concept, this application provides a fan, which mainly includes a volute 6, an air inlet adjustment structure as described in any of the preceding embodiments, and a sound pressure detection device 7; the air inlet adjustment structure is assembled at the air inlet of the volute 6; the sound pressure detection device 7 is assembled on the volute and close to the air inlet of the volute 6.

[0056] Based on the aforementioned embodiments, in this embodiment, the sound pressure detection device 7 is fixed to the volute 6, and the sound pressure detection device 7 and the air intake adjustment structure are at a reasonable distance to ensure the validity of the sound pressure data detected by the sound pressure detection device 7.

[0057] like Figure 1 As shown, based on the same inventive concept, this application provides a range hood, which mainly includes the fan described in any of the foregoing embodiments.

[0058] Based on the foregoing embodiments, in this embodiment, the fan is part of the air box. The range hood also includes a smoke collection hood, within which the air box can be installed. In some embodiments, the air box is located outside the smoke collection hood and connected to it.

[0059] The range hood provided in this application embodiment has multiple guide vanes 2 of the air intake adjustment structure linked together by a transmission component 3. The drive motor 4 drives one guide vane 2 to deflect, and the deflected guide vane 2 drives the remaining guide vanes 2 to deflect synchronously, so as to adjust the installation angle of all guide vanes 2, thereby realizing the adjustment of the air intake angle.

[0060] like Figure 8 As shown, based on the same inventive concept, this application provides a control method for the fan in the aforementioned embodiments, which mainly includes steps S101-S104:

[0061] Step S101: After power is turned off and on, the first sound pressure data is acquired multiple times at preset time intervals;

[0062] Step S102: Control all guide vanes 2 to deflect from the preset position to the first direction by a first angle;

[0063] Step S103: If any two adjacent first sound pressure data acquisitions meet the preset coarse adjustment rules, then control all guide vanes 2 to continue to deflect at the first angle in the first direction;

[0064] Step S104: If any two adjacent first sound pressure data acquisitions meet the preset reverse adjustment rule, then control all guide vanes 2 to deflect to the second angle in the second direction;

[0065] Step S105: If the first sound pressure data obtained meets the preset first air inlet angle determination rule, then the angle after the last deflection of the guide vane 2 is taken as the appropriate air inlet angle.

[0066] Based on the foregoing embodiments, in this embodiment, the first sound pressure data in step S101 is acquired by the sound pressure detection device 7, which is the sound pressure data acquired from the first power-on or after power-off and power-back. The first sound pressure data is used to determine the noise level, providing a basis for subsequently adjusting the deflection angle of the guide vane 2. The number of times the first sound pressure data is acquired is sufficient to determine the appropriate air inlet angle in step S104.

[0067] The preset position in step S102 is the least suitable extreme air intake angle. The noise will decrease after the guide vane 2 is deflected in any direction and at any angle from the preset position. For example, when viewed from the air intake adjustment structure, the position where the angle between the guide vane 2 and the transmission component is 90 degrees is taken as the preset position.

[0068] The adjustment process of the air intake regulating structure typically includes a coarse adjustment stage and a reverse adjustment stage; the reverse adjustment stage is performed after the coarse adjustment stage. The coarse adjustment stage corresponds to step S103, and the reverse adjustment stage corresponds to step S104. The number of coarse adjustment stages and the number of reverse adjustment stages will vary under different operating conditions. The adapted air intake angle in step S105 refers to the air intake angle adapted to the current operating conditions, at which the controllable noise is minimized.

[0069] The preset time interval in step S101 is 30 seconds. In steps S102 and S103, the first direction and the second direction are opposite, and the second angle is smaller than the first angle; optionally, the first direction is clockwise and the second direction is counterclockwise; optionally, the first direction is counterclockwise and the second direction is clockwise; optionally, the first angle is 10 degrees; optionally, the second angle is 5 degrees.

[0070] The fan control method provided in this application continuously deflects the guide vane 2 based on the acquired sound pressure data, so that the guide vane 2 is deflected to an installation angle that is compatible with the current operating conditions, thereby improving aerodynamic noise and meeting all operating conditions.

[0071] As an optional implementation, the coarse adjustment rule in the aforementioned step S103 includes: the difference between the first sound pressure data obtained in the previous acquisition and the first sound pressure data obtained in the subsequent acquisition is greater than or equal to the preset first sound pressure difference.

[0072] Based on the aforementioned embodiments, in this embodiment, coarse adjustment involves deflecting the guide vane 2 at a large angle. If the difference between the previously acquired first sound pressure data and the subsequently acquired first sound pressure data is greater than or equal to a preset first sound pressure difference, it indicates that the sound pressure has decreased, meaning the noise has decreased, and that there is still more room for noise reduction. This coarse adjustment method allows the noise to quickly reach the range required for fine adjustment.

[0073] Optionally, the first sound pressure difference is 0.5 dB.

[0074] As an optional implementation, the reverse adjustment rule in step S104 includes: the difference between the first sound pressure data acquired later and the first sound pressure data acquired previously is less than a preset first sound pressure difference.

[0075] Based on the aforementioned embodiments, in this embodiment, fine-tuning refers to a small-angle deflection of the guide vane 2. If the difference between the first sound pressure data acquired later and the first sound pressure data acquired previously is less than a preset first sound pressure difference, it indicates that the sound pressure has increased, and the guide vane 2 needs to be reversed to reduce noise.

[0076] As an optional implementation, the rule for determining the first air inlet angle in the aforementioned step S105 includes: meeting the reverse adjustment rule twice consecutively.

[0077] Based on the aforementioned embodiments, in this embodiment, if the reverse adjustment rule is met twice consecutively, the installation angle noise after the guide vane 2 is deflected after the first fine adjustment rule is met is very small and can be used as the appropriate air inlet angle. That is, after the reverse adjustment rule is met for the second time, the guide vane 2 does not need to be deflected.

[0078] In one specific embodiment, after the initial power-on or power-off and power-back, the guide vane 2 is located in the aforementioned preset position. After 30 seconds, the guide vane 2 is controlled to deflect counterclockwise by 10 degrees, that is, the angle of tangency between the guide vane 2 and the transmission component changes from 90 degrees to 80 degrees. Simultaneously, the first sound pressure level data is acquired for the first time. After 30 seconds, the first sound pressure level data is acquired a second time. The difference between the first and second acquired sound pressure level data is equal to 0.5 dB. The guide vane 2 is then controlled to deflect counterclockwise by another 10 degrees, that is, the angle of tangency between the guide vane 2 and the transmission component changes from 80 degrees to 70 degrees. After 30 seconds, the first sound pressure level data is acquired a third time. The difference between the second and third acquired sound pressure level data is equal to 0.5 dB. The guide vane 2 is then controlled to deflect counterclockwise by another 10 degrees, that is, the angle of tangency between the guide vane 2 and the transmission component changes from 70 degrees to 60 degrees. Thirty seconds later, the first sound pressure level (SPL) data was acquired for the fourth time. The difference between the fourth and third SPL data was 0.4 dB. Guide vane 2 was then rotated clockwise by 5 degrees, changing the angle of tangency between guide vane 2 and the transmission component from 60 degrees to 65 degrees. Thirty seconds later, the first SPL data was acquired for the fifth time. The difference between the fifth and fourth SPL data was 0.3 dB. The position where the angle of tangency between guide vane 2 and the transmission component was 65 degrees was taken as the appropriate air inlet angle.

[0079] like Figure 9 As shown, as an optional implementation, the fan control method further includes steps S201-S204:

[0080] Step S201: After power is turned on without interruption, acquire the second sound pressure data multiple times at preset time intervals;

[0081] Step S202: If the acquired second sound pressure data conforms to the preset first pressure boosting rule, then control all guide vanes 2 to deflect to the second angle in the second direction;

[0082] Step S203: If the newly acquired second sound pressure data conforms to the preset first fine-tuning rule, then control all guide vanes 2 to deflect to the second angle in the second direction;

[0083] Step S204: If the newly acquired second sound pressure data conforms to the preset second air inlet angle determination rule, then the angle after the last deflection of the guide vane 2 is taken as the new adapted air inlet angle.

[0084] Based on the aforementioned embodiments, in this embodiment, the action performed in step S201 is performed without power-off after the previously determined suitable air inlet angle. Under this condition, the back pressure may differ from the previous condition; therefore, it is necessary to determine whether the previously determined suitable air inlet angle is compatible with the current condition. The second sound pressure data obtained in step S201 is acquired by the sound pressure detection device 7. This second sound pressure data is used to determine the noise level, providing a basis for subsequently adjusting the deflection angle of the guide vane 2. The number of times the second sound pressure data is acquired is sufficient to determine the new suitable air inlet angle.

[0085] If the second sound pressure data obtained in step S202 meets the preset first pressure increase rule, it means that the noise has increased and the installation angle of the current guide vane 2 needs to be adjusted, that is, the previously determined suitable air inlet angle does not meet the current working conditions.

[0086] If the newly acquired second sound pressure data in step S203 conforms to the preset first fine-tuning rule, it indicates that the deflection direction in step S202 is correct, and the installation angle of guide vane 2 needs to be fine-tuned. The "newly acquired second sound pressure data" in steps S203 and S204 refers to the second sound pressure data acquired after step S202. The new suitable air inlet angle in step S204 refers to the air inlet angle suitable for the current operating conditions, where the controllable noise is minimized.

[0087] In some embodiments, the first pressure increase rule in step S202 includes: the second sound pressure data continuously increases and the increase value is greater than or equal to a preset sound pressure value.

[0088] Optional, the preset sound pressure level is 1 dB.

[0089] In some embodiments, the first fine-tuning rule in step S203 includes: the difference between the previously acquired second sound pressure data and the subsequently acquired second sound pressure data is greater than or equal to a preset second sound pressure difference.

[0090] Optionally, the second sound pressure difference is 0.3 dB.

[0091] In some embodiments, the rule for determining the second air inlet angle in step S204 includes: meeting the first fine-tuning rule twice consecutively.

[0092] Based on the aforementioned embodiments, in this embodiment, if the first fine-tuning rule is met twice consecutively, the installation angle noise after the guide vane 2 is deflected after the first fine-tuning rule is met is very small and can be used as a new suitable air inlet angle. That is, after the first fine-tuning rule is met for the second time, the guide vane 2 does not need to be deflected.

[0093] Based on the aforementioned specific embodiments, in one specific embodiment, after determining the position where the guide vane 2 is tangent to the transmission component at an angle of 65 degrees as the appropriate air inlet angle, without powering off and starting the machine, after 30 seconds, the second sound pressure data is acquired for the first time; after 30 seconds, the second sound pressure data is acquired for the second time; after 30 seconds, the second sound pressure data is acquired for the third time; the difference between the second sound pressure data acquired in the second time and the second sound pressure data acquired in the first time is equal to 1 dB, and the difference between the second sound pressure data acquired in the third time and the second sound pressure data acquired in the second time is equal to 1.1 dB, and the guide vane 2 is controlled to deflect clockwise by 5 degrees, that is, the angle between the guide vane 2 and the transmission component changes from 65 degrees to 70 degrees. After 30 seconds, the second sound pressure data is acquired for the fourth time. The difference between the second sound pressure data acquired in the third and fourth acquisitions is 0.3 dB. The guide vane 2 is controlled to deflect clockwise by 5 degrees, that is, the angle between the guide vane 2 and the transmission component changes from 70 degrees to 75 degrees. After 30 seconds, the second sound pressure data is acquired for the fifth time. The difference between the second sound pressure data acquired in the fourth and fifth acquisitions is 0.3 dB. The position where the angle between the guide vane 2 and the transmission component is 75 degrees is taken as the new adaptive air intake angle and kept unchanged until the machine is turned off.

[0094] like Figure 10 As shown, as an optional implementation, the fan control method further includes steps S205-S207:

[0095] Step S205: If the newly acquired second sound pressure data conforms to the preset second pressure boosting rule, then control all guide vanes 2 to deflect to the first direction by a first angle;

[0096] Step S206: If the second sound pressure data obtained meets the preset second fine-tuning rule, then control all guide vanes 2 to deflect to the second angle in the first direction;

[0097] Step S207: If the second sound pressure data obtained meets the preset third air inlet angle determination rule, then the angle after the last deflection of the guide vane 2 is taken as the new adapted air inlet angle.

[0098] Based on the aforementioned embodiments, in this embodiment, the "newly acquired second sound pressure data" in step S205 refers to the second sound pressure data acquired after step S202. If the newly acquired second sound pressure data conforms to the preset second boost rule, it indicates that the deflection in the second direction in step S202 is an incorrect deflection direction, and it needs to be deflected in the opposite direction, that is, it needs to be deflected in the first direction to reduce noise; in addition, the deflection angle also needs to be adjusted appropriately, therefore, the first angle can be twice the second angle.

[0099] The second sound pressure data acquired in steps S206 and S207 is the second sound pressure data acquired after step S205. The new adapted air intake angle in step S207 is different from the adapted air intake angle in the aforementioned step S204. If steps S202-S204 are executed, steps S205-S207 will not be executed; similarly, if steps S205-S207 are executed, steps S202-S204 will not be executed. Regardless of the step, the "new adapted air intake angle" refers to the air intake angle adapted to the current operating conditions, at which the controllable noise is minimized.

[0100] In some embodiments, the second boost rule in step S205 includes: the second sound pressure data acquired later is greater than the second sound pressure data acquired previously.

[0101] In some embodiments, the second fine-tuning rule in step S206 includes: the difference between the second sound pressure data acquired in the previous acquisition and the second sound pressure data acquired in the subsequent acquisition is greater than or equal to a preset second sound pressure difference.

[0102] In some embodiments, the rule for determining the third air inlet angle in step S207 includes: meeting the second fine-tuning rule twice consecutively.

[0103] Based on the aforementioned embodiments, in this embodiment, if the second fine-tuning rule is met twice consecutively, the installation angle noise after the guide vane 2 is deflected after the first time the second fine-tuning rule is met is very small and can be used as a new suitable air inlet angle. That is, after the second time the second fine-tuning rule is met, the guide vane 2 does not need to be deflected.

[0104] Based on the aforementioned specific embodiments, in another specific embodiment, if the second sound pressure data acquired for the fourth time is greater than the second sound pressure data acquired for the third time, the guide vane 2 is controlled to deflect counterclockwise by 10 degrees, that is, the angle between the guide vane 2 and the transmission component changes from 70 degrees to 60 degrees; after 30 seconds, the second sound pressure data is acquired for the fifth time, and the difference between the second sound pressure data acquired for the third time and the second sound pressure data acquired for the fifth time is 0.3 dB, so the guide vane 2 is controlled to deflect counterclockwise by 5 degrees, that is, the angle between the guide vane 2 and the transmission component changes from 60 degrees to 55 degrees; after 30 seconds, the second sound pressure data is acquired for the sixth time, and the difference between the second sound pressure data acquired for the fifth time and the second sound pressure data acquired for the sixth time is 0.3 dB, so the position where the angle between the guide vane 2 and the transmission component is 55 degrees is taken as the new suitable air inlet angle, and this position is kept unchanged until the machine is turned off.

[0105] In the description of this application, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0106] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0107] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0108] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0109] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0110] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A control method of a fan, characterized by, The fan comprises A volute (6); An air inlet adjusting structure assembled at an air inlet of the volute (6); the air inlet adjusting structure comprises a guide vane support (1), a plurality of guide vanes (2), a transmission member (3) and a driving motor (4); the plurality of guide vanes (2) are all movably connected with the guide vane support (1) and can be deflected relative to the guide vane support (1); the transmission member (3) is drivingly connected with all the guide vanes (2); the driving motor (4) is drivingly connected with any one of the guide vanes (2), and the driving motor (4) is used to drive one of the guide vanes (2) to deflect to drive the remaining guide vanes (2) to deflect; A sound pressure detection device (7) assembled at the volute and close to the air inlet of the volute; The method comprises: After power-off starting, first sound pressure data is acquired multiple times at preset time interval; All the guide vanes (2) are controlled to deflect from a preset position to a first direction by a first angle; If any two adjacent acquired first sound pressure data meet preset coarse adjustment rules, all the guide vanes (2) are controlled to continue deflecting to the first direction by the first angle; If any two adjacent acquired first sound pressure data meet preset reverse adjustment rules, all the guide vanes (2) are controlled to deflect to a second direction by a second angle; the first direction and the second direction are opposite; the second angle is smaller than the first angle; If the acquired first sound pressure data meet preset first air inlet angle determination rules, the angle after the last guide vane (2) deflects is taken as an adaptive air inlet angle.

2. The fan control method according to claim 1, wherein The plurality of guide vanes (2) are in a strip shape, all the guide vanes (2) are distributed along the outer periphery of the guide vane support (1), and the first ends of all the guide vanes (2) are movably connected with the guide vane support (1), and the second ends are away from the guide vane support (1); The transmission member (3) is annular and surrounds the outside of the guide vane support (1), and the transmission member (3) penetrates all the guide vanes (2).

3. The fan control method according to claim 2, wherein The transmission member (3) comprises two rings which are parallel and spaced along the axial direction and concentrically arranged.

4. The control method of a blower according to claim 2, characterized by, Further comprising: An air inlet ring (5) surrounding the outside of the guide vane support (1); The second ends of all the guide vanes (2) are movably connected with the air inlet ring (5).

5. The fan control method according to claim 4, wherein The guide vane support (1) is in a circular ring shape, the plurality of guide vanes (2) are evenly distributed along the circumferential direction of the guide vane support (1), and all extend along the radial direction of the guide vane support (1).

6. The fan control method according to claim 5, wherein The first ends of the plurality of guide vanes (2) penetrate the guide vane support (1); The driving motor (4) is fixed to the inside of the guide vane support (1) and drivingly connected with the first end of any one of the guide vanes (2).

7. The control method of the fan according to claim 1, wherein The coarse adjustment rules comprise: The difference between the first sound pressure data acquired last time and the first sound pressure data acquired last time is greater than or equal to a preset first sound pressure difference.

8. The control method of the fan according to claim 1, wherein The reverse adjustment rules comprise: The difference between the first sound pressure data acquired last time and the first sound pressure data acquired last time is less than a preset first sound pressure difference.

9. The control method of the fan according to claim 1, wherein The first air inlet angle determination rule comprises: The last two times meet the reverse adjustment rule.

10. The control method of the fan according to claim 1, wherein Further comprising: After being turned on without power failure, the second sound pressure data is acquired multiple times at preset time interval; If the acquired second sound pressure data meets a preset first boost rule, all guide vanes (2) are controlled to deflect a second angle in a second direction; If the newly acquired second sound pressure data meets a preset first fine adjustment rule, all guide vanes (2) are controlled to deflect a second angle in a second direction; If the newly acquired second sound pressure data meets a preset second air inlet angle determination rule, the angle of the last guide vane (2) after deflection is taken as a new adaptive air inlet angle.

11. The control method of the fan according to claim 10, wherein Further comprising: If the newly acquired second sound pressure data meets a preset second boost rule, all guide vanes (2) are controlled to deflect a first angle in a first direction; the first angle is twice the second angle; If the re-acquired second sound pressure data meets a preset second fine adjustment rule, all guide vanes (2) are controlled to deflect a second angle in a first direction; If the re-acquired second sound pressure data meets a preset third air inlet angle determination rule, the angle of the last guide vane (2) after deflection is taken as a new adaptive air inlet angle.

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